Eu tenho 6 campos EditText em um xml .. no botão clique eu preciso validar se todos EditText têm valores ou está vazio. Atualmente, eu verifico cada EditText um por um .. Como posso verificar todos de uma vez.

o código

private Button BtnSave;
 EditText ev_last_name,ev_first_name,ev_email,ev_password,ev_confirm_password,ev_phone;
 String last_name,first_name,email,password,confirm_password,phone;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.signup);
    BtnSave=(Button) findViewById(R.id.BtnSave);
    ev_last_name=(EditText)findViewById(R.id.edit_lname);
    ev_first_name=(EditText)findViewById(R.id.edit_fname);
    ev_email=(EditText)findViewById(R.id.edit_email);
    ev_password=(EditText)findViewById(R.id.edit_passwd);
    ev_confirm_password=(EditText)findViewById(R.id.edit_cpasswd);
    ev_phone=(EditText)findViewById(R.id.edit_phone);



    BtnSave.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
             last_name=ev_last_name.getText().toString();
             first_name=ev_first_name.getText().toString();
             email=ev_email.getText().toString();
             password=ev_password.getText().toString();
             confirm_password=ev_confirm_password.getText().toString();
             phone=ev_phone.getText().toString();

             if ((ev_last_name.getText().toString().length() <= 0))
             {
                 System.out.println(" The EditText is empty");
                 //I will use the toast later
             }


        }
    });


}